參數(shù)資料
型號(hào)： LT3503EDCB
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 1 A SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO6
封裝： 2 X 3 MM, PLASTIC, MO-229, DFN-6
文件頁(yè)數(shù)： 7/20頁(yè)
文件大?。?/td> 423K
代理商： LT3503EDCB
15
LT3503
3503f
APPLICATIO S I FOR ATIO
WU
U
Figure 10. A Well Chosen Input Network Prevents Input Voltage Overshoot and
Ensures Reliable Operation When the LT3503 is Connected to a Live Supply
a live supply (see Linear Technology Application Note 88
for a complete discussion). The low loss ceramic capaci-
tor combined with stray inductance in series with the
power source forms an underdamped tank circuit, and the
voltage at the VIN pin of the LT3503 can ring to twice the
nominal input voltage, possibly exceeding the LT3503’s
rating and damaging the part. If the input supply is poorly
controlled or the user will be plugging the LT3503 into an
energized supply, the input network should be designed to
prevent this overshoot.
Figure 10 shows the waveforms that result when an
LT3503 circuit is connected to a 20V supply through six
feet of 24-gauge twisted pair. The first plot is the response
with a 2.2
F ceramic capacitor at the input. The input
voltage rings as high as 35V and the input current peaks
at 20A. One method of damping the tank circuit is to add
another capacitor with a series resistor to the circuit. In
Figure 10b an aluminum electrolytic capacitor has been
added. This capacitor’s high equivalent series resistance
Figure 9. Diode D4 Prevents a Shorted Input from Discharging
a Backup Battery Tied to the Output; It Also Protects the Circuit
from a Reversed Input. The LT3503 Runs Only When the Input
is Present
VIN
BOOST
GND
FB
SHDN
SW
D4
VIN
LT3503
3503 F09
VOUT
BACKUP
+
LT3503
2.2
F
VIN
20V/DIV
IIN
5A/DIV
20
s/DIV
VIN
CLOSING SWITCH
SIMULATES HOT PLUG
IIN
(10a)
(10b)
(10c)
LOW
IMPEDANCE
ENERGIZED
20V SUPPLY
STRAY
INDUCTANCE
DUE TO 6 FEET
(2 METERS) OF
TWISTED PAIR
+
LT3503
2.2
F
10
F
35V
AI.EI.
LT3503
2.2
F
0.1
F
1
3503 F10
VIN
20V/DIV
IIN
5A/DIV
20
s/DIV
VIN
20V/DIV
IIN
5A/DIV
20
s/DIV
DANGER!
RINGING VIN MAY EXCEED
ABSOLUTE MAXIMUM
RATING OF THE LT3503
Hot Plugging Safely
The small size, robustness and low impedance of ceramic
capacitors make them an attractive option for the input
bypass capacitor of LT3503 circuits. However, these ca-
pacitors can cause problems if the LT3503 is plugged into
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LT3503EDCB#TRMPBF 功能描述:IC REG BUCK ADJ 1A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開(kāi)關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2
LT3503EDCB#TRPBF 功能描述:IC REG BUCK ADJ 1A 6DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-SOIC
LT3503EDCBTRMPBF 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 3.6-20V DFN6EP
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